package com.gimi.cloud.bbp.task.common.springutil;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringUtil implements ApplicationContextAware {
  
    private static ApplicationContext applicationContext = null;
    // 非@import显式注入，@Component是必须的，且该类必须与main同包或子包
    // 若非同包或子包，则需手动import 注入，有没有@Component都一样  
    // 可复制到Test同包测试  
  
    @Override  
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null){
            SpringUtil.applicationContext  = applicationContext;
        }  
    }

    /**
     * 获取applicationContext
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;  
    }

    /**
     * 通过name获取 spring bean
      * @param name
     * @return
     */
    public static Object getBean(String name){  
        return getApplicationContext().getBean(name);  
  
    }

    /**
     * 通过class获取Bean.
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz){  
        return getApplicationContext().getBean(clazz);  
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name,Class<T> clazz){  
        return getApplicationContext().getBean(name, clazz);  
    }  
  
}  